clo.cpp: In function 'int main()':
clo.cpp:3:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
3 | cout << "hello world" << endl;
| ^~~~
| std::cout
In file included from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:75,
from clo.cpp:1:
/usr/include/c++/10/iostream:61:18: note: 'std::cout' declared here
61 | extern ostream cout; /// Linked to standard output
| ^~~~
clo.cpp:3:28: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
3 | cout << "hello world" << endl;
| ^~~~
| std::endl
In file included from /usr/include/c++/10/istream:39,
from /usr/include/c++/10/sstream:38,
from /usr/include/c++/10/complex:45,
from /usr/include/c++/10/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
from clo.cpp:1:
/usr/include/c++/10/ostream:681:5: note: 'std::endl' declared here
681 | endl(basic_ostream<_CharT, _Traits>& __os)
| ^~~~